Accession Number : AD0811463

Title :   INVESTIGATION OF NEW CONCEPTS AND LINEAR BEAM TECHNIQUES FOR MICROWAVE GENERATION.

Descriptive Note : Quarterly rept. no. 4, 1 Jul-30 Sep 66,

Corporate Author : CORNELL UNIV ITHACA NY SCHOOL OF ELECTRICAL ENGINEERING

Personal Author(s) : Dalman, G. C. ; Eastman, L. F. ; MacKenzie, L. A.

Report Date : JAN 1967

Pagination or Media Count : 106

Abstract : The objectives of this contract are to investigate practical applications of electron streams derived from laser-irradiated metal surfaces and related basic photon-metal interaction phenomena; to investigate the capabilities of beam plasma amplification; and to study active microwave effects in bulk semiconductors. In the bulk semiconductor studies, alloyed and epitaxial contacts to GaAs are described. Operation of GaAs samples at frequencies high compared to the domain transit time is discussed. Efficiencies of 3.4% have been obtained for a tuning range of 7 to 12.9 GHz. Voltage tuning of Gunn oscillators is described, which uses a split electrode configuration. Several new techniques have been employed in preparing the GaAs avalanche P-N diodes which have led to considerable improvements in performance. These include an air abrasion process for mesa formation. Fabrication techniques of InSb diodes have been improved, with one sample having a 20 volt breakdown. However, microplasmas may still be giving difficulties with these devices. In the laser-irradiated metal surfaces program, feasibility studies show that kilowatt levels of X-band power can be switched by a laser-triggered transmission cavity switch. (Author)

Descriptors :   *GALLIUM ARSENIDES), *SWITCHING CIRCUITS), (*SEMICONDUCTOR DIODES, (*LASERS, (*CAVITY RESONATORS, SEMICONDUCTOR DIODES), X BAND, ELECTRON BEAMS, EPITAXIAL GROWTH, AVALANCHE DIODES, PHOTONS, MICROWAVE AMPLIFIERS, OSCILLATION, PLASMAS(PHYSICS), INDIUM ANTIMONIDES, ION BEAMS, INFRARED RADIATION, MICROWAVE OSCILLATORS, CATHODES, ELECTRIC FIELDS, PLASMAS(PHYSICS), ELECTRICAL CONDUCTIVITY, NEGATIVE RESISTANCE CIRCUITS, ANODES, FAILURE(ELECTRONICS), ARGON, BRILLOUIN ZONES, SCATTERING, EXCITATION.

Subject Categories : Electrical and Electronic Equipment
      Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE